This is hardly a complete survey of research in the field, and as usual with academic literature the findings can be mixed due to different data sets, time periods and other methodological differences
May be sold by Traders dealing in consumables
In May 2015, R

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ARTICLE 5 - CONDITION AND DESCRIPTION OF THE LOTS The lots taken to auction will be bought where and in the condition they are in, and it is the potential buyer's responsibility to analyse their condition during their public exhibition on the days before the auction, as well as how accurate the description on the portfolio, references to possible restorations, flaws, faults, and imperfections
Of course, some items might be too large to machine wash at home, so they might need to be sent out to a dry cleaner or another expert